verb / noun

sustain

suh-STAYN/səˈsteɪn/

To keep something in effect or continuing.

The gardener waters the young tree regularly to sustain its growth.

An older East Asian gardener regularly waters a young tree to keep it alive and growing.
Etymology

To “hold up from below” is to support something and keep it from falling. That image extends to keeping an effort going or bearing a hardship, loss, or other burden.

In context

BBC Earth1:41
their mother's precious milk must sustain them throughout the winter
Baby Flying Squirrel Takes Flight for the First Time | Mammals | BBC Earth

More examples

  • Small monthly donations sustain the community food pantry.
  • The judge sustains the objection and stops the questioning.
  • This guitar has enough sustain to let each note linger.

Forms

sustain · sustains · sustained · sustaining

sustenance noun — Food or other support needed for survival.

sustainable adjective — Able to continue with available resources.

Similar words

maintain
Emphasizes keeping something at an existing level or condition.
uphold
Specifically means confirming a ruling or supporting its validity.
prolong
Emphasizes making something last longer than it otherwise would.